Rocking horse e incandescent light bulb: o que têm em comum

1. Passo 1. Rocking horse — utiliza — Pendulum. Rocking.
2. Passo 2. Pendulum — utiliza — Newton’s laws. The swing is described by Newtonian mechanics.
3. Passo 3. Newton’s laws — inclui — Reaction force. Reaction is Newton’s third law.
4. Passo 4. Reaction force — é utilizado em — Ion thruster. Jet thrust.
5. Passo 5. Ion thruster — é feito de — Tungsten. The cathodes are tungsten.
6. Passo 6. Tungsten — é material para — Incandescent light bulb. A tungsten filament (since 1904–1910).

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